isosurf matrixoutput format?

What is the format of the matrix that results from isosurf with matrixoutput on?

If I set the dim to one (e.g. in jit.gl.isosurf.help) it yields a 1×15 matrix, dim=2 gives 1×120, dim=3 gives 1×405 (all 12 plane…)

Is this triangle strip data? (trying obj export…)

thanks -Matt